利用尿素分解细菌苍白杆菌的代谢物通过微生物诱导碳酸盐沉淀来降低土壤中镉的生物利用度和植物毒性作用。POC9,Frontiers in Plant Science

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利用尿素分解细菌苍白杆菌的代谢物通过微生物诱导碳酸盐沉淀来降低土壤中镉的生物利用度和植物毒性作用。POC9
Frontiers in Plant Science ( IF 4.1 ) Pub Date : 2023-06-21 , DOI: 10.3389/fpls.2023.1109467
Marta Zakrzewska ₁ , Grzegorz Rzepa ₂ , Marcin Musialowski ₃ , Aleksandra Goszcz _{3,

4} , Robert Stasiuk ₃ , Klaudia Debiec-Andrzejewska ₃

Affiliation

应用尿素分解细菌对受重金属（包括镉（Cd））污染的土壤进行生物修复，可以通过沉淀或与碳酸盐共沉淀来有效固定重金属。微生物诱导的碳酸盐沉淀过程也可用于在各种农业土壤中种植农作物的情况，这些土壤中含有微量但法律允许的镉浓度，这些镉浓度可能仍被植物吸收。本研究旨在调查土壤补充尿素分解细菌产生的含有碳酸盐（MCC）的代谢物的影响苍白杆菌属sp。POC9 对土壤中镉的迁移率以及作物对镉的吸收效率和一般状况的影响（岩芹)。在所进行的研究框架中（i）POC9菌株的碳酸盐生产力，（ii）补充有MCC的土壤中镉的固定效率，（iii）富含MCC的土壤中碳酸镉的结晶，（iv）效果(v)研究了MCC对土壤理化和微生物特性的影响，以及(v)土壤特性变化对作物形态、生长速率和镉吸收效率的影响。实验在低浓度Cd污染的土壤中进行，以模拟自然环境条件。与对照变体相比，土壤补充 MCC 显着降低了土壤中 Cd 的生物利用度约 27-65%（取决于 MCC 的体积），并减少了植物芽和根中 Cd 的吸收约 86% 和 74%，分别。此外，由于尿素降解（MCC）过程中产生的其他代谢物降低了土壤毒性并改善了土壤营养，土壤的一些微生物特性（土壤微生物的数量和活性）以及植物的一般状况都得到了改善。也显着改善。土壤中添加 MCC 可有效稳定镉，并显着降低其对土壤微生物群和植物的毒性。因此，POC9菌株产生的MCC不仅可以用作土壤中有效的Cd固定剂，还可以用作微生物和植物刺激剂。以及植物的总体状况也得到显着改善。土壤中添加 MCC 可有效稳定镉，并显着降低其对土壤微生物群和植物的毒性。因此，POC9菌株产生的MCC不仅可以用作土壤中有效的Cd固定剂，还可以用作微生物和植物刺激剂。以及植物的总体状况也得到显着改善。土壤中添加 MCC 可有效稳定镉，并显着降低其对土壤微生物群和植物的毒性。因此，POC9菌株产生的MCC不仅可以用作土壤中有效的Cd固定剂，还可以用作微生物和植物刺激剂。

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Reduction of bioavailability and phytotoxicity effect of cadmium in soil by microbial-induced carbonate precipitation using metabolites of ureolytic bacterium Ochrobactrum sp. POC9

The application of ureolytic bacteria for bioremediation of soil contaminated with heavy metals, including cadmium (Cd), allows for the efficient immobilization of heavy metals by precipitation or coprecipitation with carbonates. Microbially-induced carbonate precipitation process may be useful also in the case of the cultivation of crop plants in various agricultural soils with trace but legally permissible Cd concentrations, which may be still uptaken by plants. This study aimed to investigate the influence of soil supplementation with metabolites containing carbonates (MCC) produced by the ureolytic bacterium Ochrobactrum sp. POC9 on the Cd mobility in the soil as well as on the Cd uptake efficiency and general condition of crop plants (Petroselinum crispum). In the frame of the conducted studies (i) carbonate productivity of the POC9 strain, (ii) the efficiency of Cd immobilization in soil supplemented with MCC, (iii) crystallization of cadmium carbonate in the soil enriched with MCC, (iv) the effect of MCC on the physico-chemical and microbiological properties of soil, and (v) the effect of changes in soil properties on the morphology, growth rate, and Cd-uptake efficiency of crop plants were investigated. The experiments were conducted in soil contaminated with a low concentration of Cd to simulate the natural environmental conditions. Soil supplementation with MCC significantly reduced the bioavailability of Cd in soil with regard to control variants by about 27-65% (depending on the volume of MCC) and reduced the Cd uptake by plants by about 86% and 74% in shoots and roots, respectively. Furthermore, due to the decrease in soil toxicity and improvement of soil nutrition with other metabolites produced during the urea degradation (MCC), some microbiological properties of soil (quantity and activity of soil microorganisms), as well as the general condition of plants, were also significantly improved. Soil supplementation with MCC enabled efficient Cd stabilization and significantly reduced its toxicity for soil microbiota and plants. Thus, MCC produced by POC9 strain may be used not only as an effective Cd immobilizer in soil but also as a microbe and plant stimulators.

更新日期：2023-06-21

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